GLASS STABILITY AND CRYSTALLIZATION KINETICS ON THE SrO-CaO-B2O3-SiO2-TiO2 GLASS SYSTEM

Reference Presenter Authors
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Abstract
10-043 Aluisio Alves Cabral Cabral, A.A.(Federal Institute of Maranhao); Rodrigues, A.M.(Federal University of São Carlos (UFSCar)); Rodrigues, A.C.(Federal University of São Carlos); Pascual, M.J.(Instituto de Cerámica y Vidrio); DURÁN, A.(INSTITUTO DE CERÁMICA Y VIDRIO); It has been assumed that the glass stability (GS) may be related to the overall crystallization activation energy, i.e., the most resistant glass composition to the crystallization requires higher energy to be crystallized. In this paper, seven compositions belonging to the (26-0.25x)CaO.(26-0.25x)SrO.(4–0.05x)B2O3.xTiO2.(44–0.45x)SiO2 glass system, where x varies between 0 and 8mol% of TiO2, were prepared by the conventional melting/quenching procedures. Then, bulk glass samples were heated in a DSC furnace (air, Pt-Rh crucible) up to 1400ºC at different rates (5 – 50 K/min) in order to register the correspondent onset glass transition, crystallization and melting/liquidus temperatures. The activation energies for the overall crystallization (E) and the Avrami coefficient (n) were calculated using the Ozawa and Matusita & Sakka models, respectively. On the other hand, the glass stability (GS) was evaluated by the Hruby (KH), Weinberg (KW) and Lu and Liu (KLL) parameters. It was demonstrated that the activation energy did not change with the TiO2 content, while the glass-stability increased with the increasing TiO2 content.
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